dbd54342fd
This allows us to attach additional context to the biobuf so can read from some sort of data structure without a global variable.
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
#pragma src "/sys/src/libbio"
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#pragma lib "libbio.a"
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typedef struct Biobuf Biobuf;
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typedef struct Biobufhdr Biobufhdr;
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enum
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{
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Bsize = 8*1024,
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Bungetsize = UTFmax+1, /* space for ungetc */
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Bmagic = 0x314159,
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Beof = -1,
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Bbad = -2,
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Binactive = 0, /* states */
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Bractive,
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Bwactive,
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Bracteof,
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};
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struct Biobufhdr
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{
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int icount; /* neg num of bytes at eob */
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int ocount; /* num of bytes at bob */
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int rdline; /* num of bytes after rdline */
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int runesize; /* num of bytes of last getrune */
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int state; /* r/w/inactive */
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int fid; /* open file */
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int flag; /* magic if malloc'ed */
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vlong offset; /* offset of buffer in file */
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int bsize; /* size of buffer */
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uchar* bbuf; /* pointer to beginning of buffer */
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uchar* ebuf; /* pointer to end of buffer */
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uchar* gbuf; /* pointer to good data in buf */
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void (*errorf)(char *); /* called on error if not nil */
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int (*iof)(Biobufhdr*, void *, long); /* called to do i/o */
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void *aux; /* user data */
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};
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struct Biobuf
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{
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Biobufhdr;
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uchar b[Bungetsize+Bsize];
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};
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/* Dregs, redefined as functions for backwards compatibility */
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#define BGETC(bp) Bgetc(bp)
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#define BPUTC(bp,c) Bputc(bp,c)
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#define BOFFSET(bp) Boffset(bp)
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#define BLINELEN(bp) Blinelen(bp)
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#define BFILDES(bp) Bfildes(bp)
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int Bbuffered(Biobufhdr*);
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int Bfildes(Biobufhdr*);
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int Bflush(Biobufhdr*);
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int Bgetc(Biobufhdr*);
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int Bgetd(Biobufhdr*, double*);
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long Bgetrune(Biobufhdr*);
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int Binit(Biobuf*, int, int);
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int Binits(Biobufhdr*, int, int, uchar*, int);
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int Blinelen(Biobufhdr*);
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vlong Boffset(Biobufhdr*);
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Biobuf* Bopen(char*, int);
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Biobuf* Bfdopen(int, int);
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int Bprint(Biobufhdr*, char*, ...);
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int Bvprint(Biobufhdr*, char*, va_list);
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int Bputc(Biobufhdr*, int);
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int Bputrune(Biobufhdr*, long);
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void* Brdline(Biobufhdr*, int);
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char* Brdstr(Biobufhdr*, int, int);
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long Bread(Biobufhdr*, void*, long);
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vlong Bseek(Biobufhdr*, vlong, int);
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int Bterm(Biobufhdr*);
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int Bungetc(Biobufhdr*);
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int Bungetrune(Biobufhdr*);
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long Bwrite(Biobufhdr*, void*, long);
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void Blethal(Biobufhdr*, void(*)(char*));
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void Berror(Biobufhdr*, char*, ...);
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void Biofn(Biobufhdr*, int(*)(Biobufhdr*, void*, long));
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#pragma varargck argpos Bprint 2
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#pragma varargck argpos Berror 2
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